Cooling Of The Heat Pump - REMKO WKF-compact Series Assembly And Operating Instructions Manual

7 Cooling of the
heat pump
Description of the cooling installation
Cooling via mixed heating cycle
(surface heating cycle)
If the series WKF heat pump is to be used for
cooling, then this must be possible via the mixed
heating cycle. The hydraulic connection is identical
to the connection for the heating cycle. If the circuit
is used for heating or cooling, it will be connected
as presented in the hydraulic circuit diagrams on
pages and . The sensors S12 and S11 measure
the inlet and return temperatures, when a heating-/
cooling buffer is used.
Cooling via a separate cooling circuit
If a separate cooling circuit should be used with
the system in addition to the heating cycles, then a
changeover valve (A14) must be installed in the
inlet pipe, which is activated with 230 V. This is
attached to the controller on A14. In cooling mode,
the valve is switched to the cooling circuit AB/A. If
no cooling mode is operated, the valve is de-ener-
gised at AB/B heating cycle.
Dewpoint control via the Smart Control cable
remote control
If the series WKF heat pump is to be used to
implement a cooling function, the Smart Control
cable remote control must be installed in the
selected reference room (e.g. living room). It is rec-
ommended that it is mounted on the wall. It must
thereby ensured that the room air can freely flow
over the remote control. The remote control meas-
ures the room temperature and room humidity.
From these it calculates the nominal dewpoint and
correspondingly adjusts the cooling water tempera-
ture with a sufficient safety margin so that the tem-
perature on the activated room surface as well as
the exposed pipes does not fall below the dew-
point.
The water temperature in the pipes is main-
tained above the nominal dewpoint tempera-
ture by the controller, in order to prevent the
formation of condensation on the exposed
pipes as well as those concealed under the
plaster.
It is also recommended to install a 230 V dewpoint
monitor with the associated pipe temperature sen-
sors to the feed pipes outside the heat pump. The
location should be selected so that it does not
favour the temperature falling below the dewpoint.
The dewpoint monitor is wired so that it divides the
connector in the feed line to the utility company
switch to the controller (input S16) in order to
switch of the heat pump.
Cooling without installed cable remote control
in the room
If no additional remote control apart from the heat
pump is to be installed in the room, the regulation
of the minimum inlet temperature is via the outside
temperature minus 6 K. It is then essential to
mount an additional 230 V dewpoint monitor with
associated pipe temperature sensors on the inlet
pipes. The location should be selected so that it
does not favour the temperature falling below the
dewpoint. The dewpoint monitor is wired so that it
divides the connector in the feed line to the utility
company switch to the controller (input S16) in
order to switch of the heat pump.
Cooling via a parallel buffer tank as system
boundary
If the system is to be operated with a parallel buffer
tank, which acts as system boundary to the con-
sumer circuit, then there is no need to mounted a
remote control in the living room, if the regulation
of the consuming cooling circuit is operated via an
external controller.
Cooling via setpoint
If no additional remote control is installed in the
room, the cooling system can be operate at a set-
point that is above the dewpoint.
Example: minimum inlet temperature not less than
+ 16 ° C
NOTICE!
Minimum water volume
If the system/water volume in the cooling circuit
provided by the customer is less than 5L/kW
cooling capacity, an additional buffer tank is
recommended to increase the volume. This
can be incorporated as a serial buffer in the
return flow or as a hydraulic compensator. The
KPS series buffer tank can be supplied by
REMKO for this.
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